<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<a href="level-1.html">等级1</a><br><br>
<a href="level-2.html">等级2</a><br><br>
<a href="level-3.html">等级3</a>
</body>
</html>